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12th Standard Biology English Medium Zoology - Reproduction in Organisms 2 Mark Book Back Question Paper and Answer Key 2022 - 2023

Published on: 26/08/2022

QB365 provides a detailed and simple solution for every Possible Book Back Questions in Class 12 Biology Subject - Zoology - Reproduction in Organisms, English Medium. It will help Students to get more practice questions, Students can Practice these question papers in addition to score best marks.

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Questions:

Generic 2

6 x 2 = 12

Why are the offsprings of oviparous animal at a greater risk as compared to offsprings of viviparous organisms?

What is the difference between syngamy and fertilization?

How is juvenile phase different from reproductive phase?

Why is the offspring formed by asexual reproduction referred as a clone?

Name the phenomenon where the female gamete directly develops into a new organism with an avian example.

Name an organism where cell division is itself a mode of reproduction.

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Answers Key:

Generic 2

6 x 2 = 12

Oviparous animals lay eggs outside of their body. Thus, the eggs have to face the harsh environmental conditions like excessive heat or cold, predators, water scarcity etc. On the other hand, in viviparous animals, the development of the egg takes place inside the body of the female. The egg is well protected from the unfavourable conditions. Hence, the offspring of an egg-laying or oviparous animal is at greater risk as compared to the offspring of a viviparous animal, which gives birth to its young ones.

syngamy	fertilization
It is the fusion of two haploid gametes to form a diploid zygote	It is the act (or) process of rendering fertile zygote as the result of Fertilization

juvenile phase	reproductive phase
lt is also known as young and Vegetative Phase	It is also known as Maturity adult Phase
lt is the period of growth between the birth of the individual upto reproductive maturitiy.	The organisms reproduce and their offsprings reach maturity period

Offsprings produced by asexual reproduction are called clones, because they are genetically as well as morphologically similar to the parent organism.
They are not only similar to one another, but are also exact copies of their parent (e,g): Amoeba, Spirogyra, Hydra, Yeast, etc.

Parthenogenesis is the phenomenon in which female gamete directly develops into a new organism. (e,g:) Honeybee (male or drone).

In monocellular organs cell division is itself a mode of reproduction. (e.g:) Bacteria, Euglena and Amoeba.